fix: update client test

Author: EvolveArt

pragma-sdk/tests/integration/update_client_test.py

@@ -57,11 +57,11 @@ async def declare_oracle(forked_client: PragmaOnChainClient) -> DeclareResult:
     except ClientError as err:
         if "is already declared" in err.message:
             hash_str = (
-                err.message.split('ClassHash(StarkFelt("')[1]
-                .split('"))')[0]
-                .replace("0x", "")
+                err.data["execution_error"]
+                .split("Class with hash ")[1]
+                .split(" is already declared")[0]
             )
-            return MagicMock(class_hash=int(f"0x{hash_str}", 16))
+            return MagicMock(class_hash=int(hash_str, 16))
         else:
             logger.info("An error occured during the declaration: %s", err)
             raise err